---
id: CVE-2026-4869
title: >-
  A potential privilege escalation issue was identified in InstallShield version
  2025 R2 and earlier when running compressed Basic MSI setup with Prerequisites
  from an insecure location
summary: >-
  A potential privilege escalation issue was identified in InstallShield version
  2025 R2 and earlier when running compressed Basic MSI setup with Prerequisites
  from an insecure location. If a local administrator launches a compressed
  Setup…
severity: medium
cvss: 5.4
cvssVector: 'CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'
cwe:
  - CWE-426
vendor: Flexera
product: InstallShield
affected:
  - InstallShield <= 2025 R2
published: '2026-10-13'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T16:00:33.533'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-4869'
references:
  - url: >-
      https://community.revenera.com/s/article/CVE-2026-4869-Potential-Privilege-Escalation-in-InstallShield-2025-R2-running-Setup-Prerequisites-from-an-insecure-directory
    label: PSIRT-CNA@flexerasoftware.com
tags:
  - nvd
  - cve.org
epss: 0.00112
epssPercentile: 0.01386
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-13T14:52:25.727869Z'
cvssSource: cna
ingestedAt: '2026-10-13T15:33:40.077Z'
---

## Overview

A potential privilege escalation issue was identified in InstallShield version 2025 R2 and earlier when running compressed Basic MSI setup with Prerequisites from an insecure location. If a local administrator launches a compressed Setup.exe with Prerequisites from an unsecured location, the Prerequisite installers also might load from an unsecured location, potentially leading to privilege escalation.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.